enzymes

Cards (10)

  • all proteins are enzymes but not all enzymes are proteins
  • What are enzyme?
    • specialised proteins
    • large and globular
    • catalyse chemical reactions
  • What affects enzymes?
    • temperature
    • pH
  • Types of enzyme reactions:
    • all enzymes are substrate specific
    • reactions occur due to the lock and key method
    • reactions can be Catabolic (tear down) or Anabolic (build up)
  • Enzyme sensitivity to temperature:
    • all enzymes have an optimum temperature
    • if temperature increases past optimum = DENATURATION
    • if temperature decreases below optimum = DEACTIVATION
  • Effect of pH on enzyme activity:
    • all enzymes have an optimum pH where their activity is at its highest
    • A deviation, whether higher or lower, will result in DENATURATION of the enzyme and a drop in enzyme activity
  • DENATURATION:
    • Structural change in active site
    • Irreversible
  • DEACTIVATION:
    • No change in the active site
    • Activity decreases
    • Reversible process
  • Enzyme Optimum pH Location
    salivary amylase 7 saliva mouth
    pepsin 2 stomach
    trypsin 8-9 small intestine
    catalase 6-8 liver
    alkaline solution 9 liver
  • Temperature is all 37 degrees celsius because that is our body temperature